Charge up.

Exposure's Smart Port Technology Plus has changed the way lighting systems are powered and expanded with accessories like a back-up battery and taillights. New lights come with one charger cable, but if you'd like to keep one at the office or in the car, you'll need one of these USB Cable Charger's to keep your Exposure light topped off.

Here's what others have to say...

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It's a cable, it charges, it works

Familiarity:
I've used it several times

I don't think Exposure's chargers are two piece seperate cable and plug in box (at least mine isn't), so if you want to be able to charge off a USB, you'll need this. $10 is pretty good insurance to leave at the office if you forgot to charge at home. Won't tell you when the light's charged.